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Application-Driven Studies of Photomechanical Materials.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Application-Driven Studies of Photomechanical Materials./
Author:	Bernhardt, Elizabeth Adeline.
Description:	1 online resource (221 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Contained By:	Dissertation Abstracts International79-11B(E).
Subject:	Physics. -
Online resource:	click for full text (PQDT)
ISBN:	9780438103924

Application-Driven Studies of Photomechanical Materials.
Bernhardt, Elizabeth Adeline.

Application-Driven Studies of Photomechanical Materials. - 1 online resource (221 pages)

Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.

Thesis (Ph.D.)--Washington State University, 2018.

Includes bibliographical references

Deep brain stimulation therapy is a well-established medical procedure with well-documented benefits, but this procedure would be enhanced by a flexible therapy device that could bend when photoactivated. To this end, two types of materials, which respond to light by inducing a stress and strain, show promise and are therefore selected to be characterized: photomechanical dye-doped glassy polymer fibers and liquid crystal elastomers. A custom designed and built apparatus, the photorheometer, measures the force created by these materials during photostimulation. Using the developed theory, it is found that the liquid crystal elastomers produce a large strain but small stress while dye-doped glassy polymer fibers produce a large stress but small strain.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780438103924Subjects--Topical Terms:

564049
Physics.
Index Terms--Genre/Form:

554714
Electronic books.

Application-Driven Studies of Photomechanical Materials.
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245 1 0 $a Application-Driven Studies of Photomechanical Materials.
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300 $a 1 online resource (221 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
500 $a Includes supplementary digital materials.
500 $a Adviser: Mark G. Kuzyk.
502 $a Thesis (Ph.D.)--Washington State University, 2018.
504 $a Includes bibliographical references
520 $a Deep brain stimulation therapy is a well-established medical procedure with well-documented benefits, but this procedure would be enhanced by a flexible therapy device that could bend when photoactivated. To this end, two types of materials, which respond to light by inducing a stress and strain, show promise and are therefore selected to be characterized: photomechanical dye-doped glassy polymer fibers and liquid crystal elastomers. A custom designed and built apparatus, the photorheometer, measures the force created by these materials during photostimulation. Using the developed theory, it is found that the liquid crystal elastomers produce a large strain but small stress while dye-doped glassy polymer fibers produce a large stress but small strain.
520 $a Photoisomerization in dyes, a mechanism where a molecule changes shape in response to photostimulation, is investigated in dye-doped glassy polymer fibers. Results show glassy polymer fibers doped with isomerizable dyes have a notable polarization dependence, but this dependence cannot be fully explained by isomerization alone, as non-isomerizable dyes also have a polarization dependence.
520 $a Liquid crystal elastomers from two synthesis methods are characterized. The first method creates side-chain end-on siloxane-based liquid crystal elastomers, and the second method is a two-stage procedure creating main-chain acrylate-based liquid crystal elastomers. Using the photorheometer, materials made with the different synthesis methods are charactered with various liquid crystalline order. The materials made with the two-stage procedure are also characterized as a function of pre-strain, dye concentration, and crosslink density. Results show monodomain (highly ordered liquid crystal elastomer), low dye concentration, and crosslinked liquid crystal elastomers have a larger photomechanical response than polydomain, high dye concentration (0.25%mol--1% mol), non-crosslinked liquid crystal elastomers.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Physics. $3 564049
650 4 $a Optics. $3 595336
650 4 $a Materials science. $3 557839
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710 2 $a Washington State University. $b Physics. $3 1191036
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10750959 $z click for full text (PQDT)